Can I calculate eigenvectors and eigenvalues?

[Murphy Waggoner]

I see some downloads for macros to calculate eigenvectors and eigenvalues
when I google "eigenvectos excel" but I am worried about trusting any of
them. Does anyone recommend a reliable add-in? Carol Alexander writes in
"Quantitative Methods in Finance" says there are add-ins that'll do the job.

Thanks.

 

[Robert Crandal]

Rather than using these add-in macros, isn't it possible
to create your own macros that inspect a spreadsheet
or table of data (ie. matrix) and then perform the necessary math
to calculate your eigenvectors or eigenvalues??